Bobbin-case latch for sewing-machines.



6. WI NELSON.

BOBBIN CASE LATCH FOR SEWING MACHINES.

APPLICATION FILED FEB. I- I916.

1 ,274, 188. Patented July 30, 1918.

2 1" 4-5 I I .I I

I I I II II I I I IN VEN T01? HIS A Ilia/ME) Fig. 4 showing the latch device Um STATES PATENT" OFFICE.

(IE 03GB W, NELSON, 01' CLEVELAND, OHIO, SIG-NOB TO THE STANDARD Sm? mom: COHPLNY, OI CLEVELAND, OHIO, ACOBPOBA'I'ION 01' OHIO.

ROBERT-CASE LATCH FOB SEWING-MACHINES.

Specification of Letter-l Patent.

Application filed February 1, me. Serial No. 75,4.

To all whom it may concern:

Be it known that I, Gnoncn W. NELSON, a citizen of the United States, and resident of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Bobbin- Case Latches for Sewing-Machinesmf which the following is a speci cation.

My invention relates to bobbin-case latches for sewing machines and especially to bob bin-case latches of the type adapted to hold a non-rotary bobbin-case in its operative position within the open chamber of a rotary hook or loop-taker.

The main object of my invention "is to provide an improved latch device ofthe type referred to, by means of which the placing of the bobbin-case in the hook chamber, and the free passage of the thread-loop about the bobbin-case when in said'chamber, may be facilitated. 1

To this end the invention consists in the novel construction, arrangement .and combinations of parts hereinafter set forth in detail in connection with the accompanying drawings illustrating the invention.

In said drawings, which show only so much of a sewing machine as is necessary for the illustration of my invention,-

Figure 1 is a front end elevation of a rotary hook and its supported bobbin-case, with my improved latch device for holding the bobbin-case in its operative position in the chamber of the hook;

Fig. 2 is a top plan view of the same,

with the hook partly broken away to more.

clearly show the seating of the bobbin-case therein;

Fig. 3 is a side elevation of the same as viewed from the right in Fig. 1; and- Figs. 4 and 5 are sectional side elevations, with the section taken on line 4-5 of Fig. 2; open and with the bobbin-case seated thereon preparatory to being placed or inserted into the hook chamber by the closin of the latch, and Fig. 5 showing the late device closed and retaining the bobbin-case in its operative position in the hook chamber.

Similar reference characters indicate like parts in the several figures of the drawings.

The hook, bobbin-case, and bobbin-case latch here shown, are the same as those disclosed, but not claimed, in my co-pending 1 said chamber.

application Serial No. 65,479, filed December 7, 1915. a

The hook and associated parts are carrled by a bracket 2, adapted to be suitably connected with the bed-plate of the machine in a manner, for instance, as disclosed in my aforesaid application. J ournaled in this bracket is a rotary hook shaft 3 carrying at its front end an attached hook 4 having an open chamber 5 in its face side. Removably seated in the chamber of said hook is a bobbin-case 6,' which is formed with a peripheral race-bearing surface 7 adapted to be seated in a race-way 8 formed in the said hook chamber adjacent the front side thereof, as shown."

The bobbin-case 6 is adapted to be removably retained in its operative position in the open hook chamber by means of an engaging latch device 9 located in front of This latch is here shown in the form of a plate having two cars 10, 10, at its lower side pivoted to two forwardly projecting arms 11, 11, of the supporting bracket 2, by means of pivot pins 12, 12, whereby the latch may be swung outwardly from the face of the hook to an inclined position as shown in Fig. 4, permitting of the insertion or removal of the bobbin-case and bobbin. When the latch is closed, it is held in such position by means of a spring catch 13 connected-to the supportin bracket at 14, and having a shoulder 15 $01 enga 'ng with the latch at one side thereof, as est shown in Fig. 3.

One ofthe features of my present invention is the means for facilitating the placing of the bobbin-case into the hook chamber through the instrumentality of the latch. This comprises'the provision of an inwardlyprojecting arm 16 adjacent the lower edge of the latch, which is so arranged that, when the latch is open, it will engage the lower beveled face of the bobbin-case resting on the latch and su port said bobbin-case in a position with itsgower edge entered into the 00k chamber, as clearly shown in Fig. 4, whereby, u on the closing of the latch, the supported bbin-case will be caused to -be properly entered and positioned in the hook chamber, as clearly shown in Fig. 5. After the bobbin-case has been so entered into the hook chamber it will be loosely retained therein at its lower side by the engagement;

Patented July a0, 1918.

therewith of said arm 16, as shown in Fig. 5. The arm 16 thus serves a two-fold purpose, first, as a means for assuring the ready entry of the bobbin-case into the hook chamber, and second, as a means for loosely retaining the bobbin-case in said chamber after having been entered therein.

The arm 16, as here shown, is adjustable on the latch in a direction toward and from the bobbin-case, in order to provide proper clearance between it and the bobbin-case for the free passage of the thread-loop about the latter in the stitch forming operation. Such adjustment also permits of the proper positioning of the bobbin-case on the latch for entry into the hook chamber, as will be clear by reference to Fig. t. Any suitable means for providing such adjustment of the arm 16 may be had. In the present case, said arm is carried at the lower end of a spring plate 17 adjustably held to the face side of the latch by an adjustingscrew 18. The upper end of this spring plate 17 extends beneath a lip 19 on the latch by which the plate is held with its lower or arm-carrying end normally pressing outwardly from the face of the latch and in engagement with the head of the adjusting-screw 18. With this construction and arrangement of parts, a turning of the adjusting screw 18 in the proper direction will effect the desired forward or backward adjustment of the arm 16.

As a means for holding the bobbin-case in the hook chamber, I prefer to employ, in addition to the arm 16 which engages the bobbin-case at its lower side, a further means which will engage with the bobbin-case adjacent its upper side. This further means comprises an inwardly turned extension 20 of the latch 9 engaging the thread-guide arm 21 at the upper side of the bobbin-case. This two-point engagement of the latch with the bobbin-case, through the parts 16 and 20, serves to properly maintain the bobbincase in the hook chamber and at the same time presents a minimum resistance to the thread-loop in its passage about the bobbincase.

In order to assure the proper positioning of the bobbin-case on the latch in the manner described, preparatory to its being entered into the hook chamber by the closing of the latch, I have provided the latch with an inwardly-turned wing or arm 22 for loosely engaging the bobbin-case within a notch 23 at one side thereof as shown. The engagement of this arm 22 with the bobbincase also serves in addition to positioning the bobbin-case on the latch for entry into the hook chamber-as a means for holding the bobbin-case against rotation in a backward direction, 2'. 6., a direction counter to the direction of rotation of the hook; the bobbin-case being held against rotation in a forward direction by the engagement of its arm 21 with a shoulder 24 on the latch, as clearly shown in Fig. 2.

As a means to automatically open the latch when released by :itscatch 13, a coil spring 25 is located on one of the pivot pins 12 with one end engaging the latch and normally exerting an outward pressure against the same. latch to the open inclined position shown in Fig. 4, under the action of said spring, is limited by the engagement of the lower edge of the latch, as at 26, with the adjacent ends of the bracket arms 11.

What I claim is:

1. In a sewing machine, the combination with a rotary hook having an open chamber in its face side, and a non-rotary bobbincase adapted to be loosely seated in said chamber, of a bobbin-case latch pivotally supported to open outwardly at its top from the hook Chamber, and means for holding the latch in an inclined position opposite said chamber whenin open position, said latch having means adapted, when the latch is open, to support the bobbin-case with its loweredge entered into the chamber of the hook, for the purpose set forth.

2. In a sewing machine, the combination with a rotary hook having an open chamber in its face side, and a non-rotary bobbincase adapted to be loosely seated in said The outward movement of the chamber, of a bobbin-case latch pivotally supported to open outwardly at its top from the hook chamber, and means for holding the latch in an inclined position opposite said chamber when in open position, said latch having an inwardly projecting arm adapted, when the latch is open, to support the bobbin-case with its lower edge entered into the chamber of the hook, for the purpose set forth.

In a sewing, machine, the combination with a rotary hook having an open chamber in its face side, and a non-rotary bobbin-case adapted to be loosely seated in said chamber, of a bobbin-case latch pivotally supported to open outwardly at its top from the hook chamber, and means for holding the latch in an inclined position opposite said chamber when in open position, said latch having means adapted, when the latch is open, to support the bobbin-case with its lower edge entered into the chamber of the hook, and means for adjusting said supporting means on the latch in a direction toward and from the hook.

4. In a sewing machine, the combination with a rotary hook having an open chamber in its face side, and a non-rotary bobbin-case adapted to be loosely seated in said chamber, of a bobbin-case latch pivotally supported to open outwardly at its top from the hook chamber, and means for holding the latch in an inclined position opposite said chamber when in open position, said latch having .ber, and 8 said chamber.

5. In a sewing machine, the combination,

with arotary hook having an open chamber in its face side, and a non-rotary bobbincase havin a, beveled face portion and adapted to %e loosely seated in said chamber, of a bobbin-case latch pivotall supported to open outwardly at its to fi om the hook chamber, and means for ho ding the latch in an inclined position opposite said chamber when in open position, said latch having an inwardly projecting arm adapted when the latch is open, to engage said beveled face of the bobbin-case and support the latter with its lower edge entered into the chamber of the hook, and when the latch is closed, to

loosely engage the bobbin-case .and retain the same within said chamber.

6. In a sewing machine, the combination with a rotary hook having an open chamber in its face side, and a non-rotary bobbin-case adapted to be. loosely seated in said chamber, of a. pivoted bobbin-case latch located in front of the chamber and having an inwardly projecting arm adapted, when the latch is open, to support the bobbin-case with its lower edge entered into the chamber of the hook, and when the latch is closed, to loosely-engage the bobbin-case and retain the same within said chamber, and means for adjusting said arm' on the latch toward and from the bobbin-case. 1

7. Ina sewing machine, the combination with a rota hook having an open chamber in its face slde, of a non-rotary bobbin-case adapted to be loosely seated in said champivoted latch device for removably hold' the bin-case and latch being provlded with an arm on one the bobbin-case in said chammean at the top of the bobbin-case forholding the latter against rotation in one direction and with cooperat- -m means at the side of the bobbin-case for ho ding the latter against rotation in the opposite direction, the last-named means he- 1ng also operative to position the bobbincase on the latch prior to the closing of the latter.

8. In a, sewing machine, the combination with a rotary hook having an open chamber in its face side, of anon-rotary bobbin-case adapted to be loosely seated in said chamber, and a pivoted latch device for removably holding the bobbin-case in said chamber, the bobbin-case and latch being providedwith cooperating means at the .top of the bobbincase for holding the latter against rotation in one direction and with cooperating means at the side of the bobbin-case for, holding the latter against rotation 'in the opposite c5 direction, the last named means comprising a part engaging a notch in the other; and being also operative to position the bobbin-case on the latch prior to the closi of the latter. v

9. n a sewing machine, the combination with a rota hook having an open chambeiin its face side, of a non-rotary bobbin-case adapted to be loosely seated in said chamher, and a pivoted latch device located in front of the hook chamber and having inwardl projecting arms for engagin with the b0 bm-case a jacent cl sides and holding it spaced rom the. latch proper, and a thlrd arm engaging the bobbin-case within a notch therein for positionits u per an lower mg the same on the latch prior to theclosing i of the latter.

Signed at Cleveland, -in the county of Cuyahoga, and State of Ohio, this 24th day of January A. D. 1916.

' I GEORGE W. NELSON. Witnesses:

Cms. C. EMIIIONS, -H. R.-K1urr. 

